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Theorem fiiuncl 38259
 Description: If a set is closed under the union of two sets, then it is closed under finite indexed union. (Contributed by Glauco Siliprandi, 17-Aug-2020.)
Hypotheses
Ref Expression
fiiuncl.xph 𝑥𝜑
fiiuncl.b ((𝜑𝑥𝐴) → 𝐵𝐷)
fiiuncl.un ((𝜑𝑦𝐷𝑧𝐷) → (𝑦𝑧) ∈ 𝐷)
fiiuncl.a (𝜑𝐴 ∈ Fin)
fiiuncl.n0 (𝜑𝐴 ≠ ∅)
Assertion
Ref Expression
fiiuncl (𝜑 𝑥𝐴 𝐵𝐷)
Distinct variable groups:   𝑥,𝐴   𝑦,𝐵,𝑧   𝑥,𝐷,𝑦,𝑧   𝜑,𝑦,𝑧
Allowed substitution hints:   𝜑(𝑥)   𝐴(𝑦,𝑧)   𝐵(𝑥)

Proof of Theorem fiiuncl
Dummy variables 𝑢 𝑣 𝑤 are mutually distinct and distinct from all other variables.
StepHypRef Expression
1 fiiuncl.n0 . 2 (𝜑𝐴 ≠ ∅)
2 neeq1 2844 . . . 4 (𝑣 = ∅ → (𝑣 ≠ ∅ ↔ ∅ ≠ ∅))
3 iuneq1 4470 . . . . 5 (𝑣 = ∅ → 𝑥𝑣 𝐵 = 𝑥 ∈ ∅ 𝐵)
43eleq1d 2672 . . . 4 (𝑣 = ∅ → ( 𝑥𝑣 𝐵𝐷 𝑥 ∈ ∅ 𝐵𝐷))
52, 4imbi12d 333 . . 3 (𝑣 = ∅ → ((𝑣 ≠ ∅ → 𝑥𝑣 𝐵𝐷) ↔ (∅ ≠ ∅ → 𝑥 ∈ ∅ 𝐵𝐷)))
6 neeq1 2844 . . . 4 (𝑣 = 𝑤 → (𝑣 ≠ ∅ ↔ 𝑤 ≠ ∅))
7 iuneq1 4470 . . . . 5 (𝑣 = 𝑤 𝑥𝑣 𝐵 = 𝑥𝑤 𝐵)
87eleq1d 2672 . . . 4 (𝑣 = 𝑤 → ( 𝑥𝑣 𝐵𝐷 𝑥𝑤 𝐵𝐷))
96, 8imbi12d 333 . . 3 (𝑣 = 𝑤 → ((𝑣 ≠ ∅ → 𝑥𝑣 𝐵𝐷) ↔ (𝑤 ≠ ∅ → 𝑥𝑤 𝐵𝐷)))
10 neeq1 2844 . . . 4 (𝑣 = (𝑤 ∪ {𝑢}) → (𝑣 ≠ ∅ ↔ (𝑤 ∪ {𝑢}) ≠ ∅))
11 iuneq1 4470 . . . . 5 (𝑣 = (𝑤 ∪ {𝑢}) → 𝑥𝑣 𝐵 = 𝑥 ∈ (𝑤 ∪ {𝑢})𝐵)
1211eleq1d 2672 . . . 4 (𝑣 = (𝑤 ∪ {𝑢}) → ( 𝑥𝑣 𝐵𝐷 𝑥 ∈ (𝑤 ∪ {𝑢})𝐵𝐷))
1310, 12imbi12d 333 . . 3 (𝑣 = (𝑤 ∪ {𝑢}) → ((𝑣 ≠ ∅ → 𝑥𝑣 𝐵𝐷) ↔ ((𝑤 ∪ {𝑢}) ≠ ∅ → 𝑥 ∈ (𝑤 ∪ {𝑢})𝐵𝐷)))
14 neeq1 2844 . . . 4 (𝑣 = 𝐴 → (𝑣 ≠ ∅ ↔ 𝐴 ≠ ∅))
15 iuneq1 4470 . . . . 5 (𝑣 = 𝐴 𝑥𝑣 𝐵 = 𝑥𝐴 𝐵)
1615eleq1d 2672 . . . 4 (𝑣 = 𝐴 → ( 𝑥𝑣 𝐵𝐷 𝑥𝐴 𝐵𝐷))
1714, 16imbi12d 333 . . 3 (𝑣 = 𝐴 → ((𝑣 ≠ ∅ → 𝑥𝑣 𝐵𝐷) ↔ (𝐴 ≠ ∅ → 𝑥𝐴 𝐵𝐷)))
18 neirr 2791 . . . . 5 ¬ ∅ ≠ ∅
1918pm2.21i 115 . . . 4 (∅ ≠ ∅ → 𝑥 ∈ ∅ 𝐵𝐷)
2019a1i 11 . . 3 (𝜑 → (∅ ≠ ∅ → 𝑥 ∈ ∅ 𝐵𝐷))
21 iunxun 4541 . . . . . . . 8 𝑥 ∈ (𝑤 ∪ {𝑢})𝐵 = ( 𝑥𝑤 𝐵 𝑥 ∈ {𝑢}𝐵)
22 nfcsb1v 3515 . . . . . . . . . 10 𝑥𝑢 / 𝑥𝐵
23 vex 3176 . . . . . . . . . 10 𝑢 ∈ V
24 csbeq1a 3508 . . . . . . . . . 10 (𝑥 = 𝑢𝐵 = 𝑢 / 𝑥𝐵)
2522, 23, 24iunxsnf 38258 . . . . . . . . 9 𝑥 ∈ {𝑢}𝐵 = 𝑢 / 𝑥𝐵
2625uneq2i 3726 . . . . . . . 8 ( 𝑥𝑤 𝐵 𝑥 ∈ {𝑢}𝐵) = ( 𝑥𝑤 𝐵𝑢 / 𝑥𝐵)
2721, 26eqtri 2632 . . . . . . 7 𝑥 ∈ (𝑤 ∪ {𝑢})𝐵 = ( 𝑥𝑤 𝐵𝑢 / 𝑥𝐵)
28 iuneq1 4470 . . . . . . . . . . . . . 14 (𝑤 = ∅ → 𝑥𝑤 𝐵 = 𝑥 ∈ ∅ 𝐵)
29 0iun 4513 . . . . . . . . . . . . . . 15 𝑥 ∈ ∅ 𝐵 = ∅
3029a1i 11 . . . . . . . . . . . . . 14 (𝑤 = ∅ → 𝑥 ∈ ∅ 𝐵 = ∅)
3128, 30eqtrd 2644 . . . . . . . . . . . . 13 (𝑤 = ∅ → 𝑥𝑤 𝐵 = ∅)
3231uneq1d 3728 . . . . . . . . . . . 12 (𝑤 = ∅ → ( 𝑥𝑤 𝐵𝑢 / 𝑥𝐵) = (∅ ∪ 𝑢 / 𝑥𝐵))
33 0un 38240 . . . . . . . . . . . . . 14 (∅ ∪ 𝑢 / 𝑥𝐵) = 𝑢 / 𝑥𝐵
34 unidm 3718 . . . . . . . . . . . . . 14 (𝑢 / 𝑥𝐵𝑢 / 𝑥𝐵) = 𝑢 / 𝑥𝐵
3533, 34eqtr4i 2635 . . . . . . . . . . . . 13 (∅ ∪ 𝑢 / 𝑥𝐵) = (𝑢 / 𝑥𝐵𝑢 / 𝑥𝐵)
3635a1i 11 . . . . . . . . . . . 12 (𝑤 = ∅ → (∅ ∪ 𝑢 / 𝑥𝐵) = (𝑢 / 𝑥𝐵𝑢 / 𝑥𝐵))
3732, 36eqtrd 2644 . . . . . . . . . . 11 (𝑤 = ∅ → ( 𝑥𝑤 𝐵𝑢 / 𝑥𝐵) = (𝑢 / 𝑥𝐵𝑢 / 𝑥𝐵))
3837adantl 481 . . . . . . . . . 10 (((𝜑𝑢 ∈ (𝐴𝑤)) ∧ 𝑤 = ∅) → ( 𝑥𝑤 𝐵𝑢 / 𝑥𝐵) = (𝑢 / 𝑥𝐵𝑢 / 𝑥𝐵))
39 simpl 472 . . . . . . . . . . . 12 ((𝜑𝑢 ∈ (𝐴𝑤)) → 𝜑)
40 eldifi 3694 . . . . . . . . . . . . 13 (𝑢 ∈ (𝐴𝑤) → 𝑢𝐴)
4140adantl 481 . . . . . . . . . . . 12 ((𝜑𝑢 ∈ (𝐴𝑤)) → 𝑢𝐴)
42 fiiuncl.xph . . . . . . . . . . . . . . . 16 𝑥𝜑
43 nfv 1830 . . . . . . . . . . . . . . . 16 𝑥 𝑢𝐴
4442, 43nfan 1816 . . . . . . . . . . . . . . 15 𝑥(𝜑𝑢𝐴)
45 nfcv 2751 . . . . . . . . . . . . . . . 16 𝑥𝐷
4622, 45nfel 2763 . . . . . . . . . . . . . . 15 𝑥𝑢 / 𝑥𝐵𝐷
4744, 46nfim 1813 . . . . . . . . . . . . . 14 𝑥((𝜑𝑢𝐴) → 𝑢 / 𝑥𝐵𝐷)
48 eleq1 2676 . . . . . . . . . . . . . . . 16 (𝑥 = 𝑢 → (𝑥𝐴𝑢𝐴))
4948anbi2d 736 . . . . . . . . . . . . . . 15 (𝑥 = 𝑢 → ((𝜑𝑥𝐴) ↔ (𝜑𝑢𝐴)))
5024eleq1d 2672 . . . . . . . . . . . . . . 15 (𝑥 = 𝑢 → (𝐵𝐷𝑢 / 𝑥𝐵𝐷))
5149, 50imbi12d 333 . . . . . . . . . . . . . 14 (𝑥 = 𝑢 → (((𝜑𝑥𝐴) → 𝐵𝐷) ↔ ((𝜑𝑢𝐴) → 𝑢 / 𝑥𝐵𝐷)))
52 fiiuncl.b . . . . . . . . . . . . . 14 ((𝜑𝑥𝐴) → 𝐵𝐷)
5347, 51, 52chvar 2250 . . . . . . . . . . . . 13 ((𝜑𝑢𝐴) → 𝑢 / 𝑥𝐵𝐷)
5434, 53syl5eqel 2692 . . . . . . . . . . . 12 ((𝜑𝑢𝐴) → (𝑢 / 𝑥𝐵𝑢 / 𝑥𝐵) ∈ 𝐷)
5539, 41, 54syl2anc 691 . . . . . . . . . . 11 ((𝜑𝑢 ∈ (𝐴𝑤)) → (𝑢 / 𝑥𝐵𝑢 / 𝑥𝐵) ∈ 𝐷)
5655adantr 480 . . . . . . . . . 10 (((𝜑𝑢 ∈ (𝐴𝑤)) ∧ 𝑤 = ∅) → (𝑢 / 𝑥𝐵𝑢 / 𝑥𝐵) ∈ 𝐷)
5738, 56eqeltrd 2688 . . . . . . . . 9 (((𝜑𝑢 ∈ (𝐴𝑤)) ∧ 𝑤 = ∅) → ( 𝑥𝑤 𝐵𝑢 / 𝑥𝐵) ∈ 𝐷)
5857adantlr 747 . . . . . . . 8 ((((𝜑𝑢 ∈ (𝐴𝑤)) ∧ (𝑤 ≠ ∅ → 𝑥𝑤 𝐵𝐷)) ∧ 𝑤 = ∅) → ( 𝑥𝑤 𝐵𝑢 / 𝑥𝐵) ∈ 𝐷)
59 simplll 794 . . . . . . . . 9 ((((𝜑𝑢 ∈ (𝐴𝑤)) ∧ (𝑤 ≠ ∅ → 𝑥𝑤 𝐵𝐷)) ∧ ¬ 𝑤 = ∅) → 𝜑)
6040ad3antlr 763 . . . . . . . . 9 ((((𝜑𝑢 ∈ (𝐴𝑤)) ∧ (𝑤 ≠ ∅ → 𝑥𝑤 𝐵𝐷)) ∧ ¬ 𝑤 = ∅) → 𝑢𝐴)
61 neqne 2790 . . . . . . . . . . . 12 𝑤 = ∅ → 𝑤 ≠ ∅)
6261adantl 481 . . . . . . . . . . 11 (((𝑤 ≠ ∅ → 𝑥𝑤 𝐵𝐷) ∧ ¬ 𝑤 = ∅) → 𝑤 ≠ ∅)
63 simpl 472 . . . . . . . . . . 11 (((𝑤 ≠ ∅ → 𝑥𝑤 𝐵𝐷) ∧ ¬ 𝑤 = ∅) → (𝑤 ≠ ∅ → 𝑥𝑤 𝐵𝐷))
6462, 63mpd 15 . . . . . . . . . 10 (((𝑤 ≠ ∅ → 𝑥𝑤 𝐵𝐷) ∧ ¬ 𝑤 = ∅) → 𝑥𝑤 𝐵𝐷)
6564adantll 746 . . . . . . . . 9 ((((𝜑𝑢 ∈ (𝐴𝑤)) ∧ (𝑤 ≠ ∅ → 𝑥𝑤 𝐵𝐷)) ∧ ¬ 𝑤 = ∅) → 𝑥𝑤 𝐵𝐷)
66533adant3 1074 . . . . . . . . . 10 ((𝜑𝑢𝐴 𝑥𝑤 𝐵𝐷) → 𝑢 / 𝑥𝐵𝐷)
67 simp3 1056 . . . . . . . . . 10 ((𝜑𝑢𝐴 𝑥𝑤 𝐵𝐷) → 𝑥𝑤 𝐵𝐷)
68 simp1 1054 . . . . . . . . . . 11 ((𝜑𝑢𝐴 𝑥𝑤 𝐵𝐷) → 𝜑)
6968, 67, 663jca 1235 . . . . . . . . . 10 ((𝜑𝑢𝐴 𝑥𝑤 𝐵𝐷) → (𝜑 𝑥𝑤 𝐵𝐷𝑢 / 𝑥𝐵𝐷))
70 eleq1 2676 . . . . . . . . . . . . . 14 (𝑧 = 𝑢 / 𝑥𝐵 → (𝑧𝐷𝑢 / 𝑥𝐵𝐷))
71703anbi3d 1397 . . . . . . . . . . . . 13 (𝑧 = 𝑢 / 𝑥𝐵 → ((𝜑 𝑥𝑤 𝐵𝐷𝑧𝐷) ↔ (𝜑 𝑥𝑤 𝐵𝐷𝑢 / 𝑥𝐵𝐷)))
72 uneq2 3723 . . . . . . . . . . . . . 14 (𝑧 = 𝑢 / 𝑥𝐵 → ( 𝑥𝑤 𝐵𝑧) = ( 𝑥𝑤 𝐵𝑢 / 𝑥𝐵))
7372eleq1d 2672 . . . . . . . . . . . . 13 (𝑧 = 𝑢 / 𝑥𝐵 → (( 𝑥𝑤 𝐵𝑧) ∈ 𝐷 ↔ ( 𝑥𝑤 𝐵𝑢 / 𝑥𝐵) ∈ 𝐷))
7471, 73imbi12d 333 . . . . . . . . . . . 12 (𝑧 = 𝑢 / 𝑥𝐵 → (((𝜑 𝑥𝑤 𝐵𝐷𝑧𝐷) → ( 𝑥𝑤 𝐵𝑧) ∈ 𝐷) ↔ ((𝜑 𝑥𝑤 𝐵𝐷𝑢 / 𝑥𝐵𝐷) → ( 𝑥𝑤 𝐵𝑢 / 𝑥𝐵) ∈ 𝐷)))
7574imbi2d 329 . . . . . . . . . . 11 (𝑧 = 𝑢 / 𝑥𝐵 → (( 𝑥𝑤 𝐵𝐷 → ((𝜑 𝑥𝑤 𝐵𝐷𝑧𝐷) → ( 𝑥𝑤 𝐵𝑧) ∈ 𝐷)) ↔ ( 𝑥𝑤 𝐵𝐷 → ((𝜑 𝑥𝑤 𝐵𝐷𝑢 / 𝑥𝐵𝐷) → ( 𝑥𝑤 𝐵𝑢 / 𝑥𝐵) ∈ 𝐷))))
76 eleq1 2676 . . . . . . . . . . . . . 14 (𝑦 = 𝑥𝑤 𝐵 → (𝑦𝐷 𝑥𝑤 𝐵𝐷))
77763anbi2d 1396 . . . . . . . . . . . . 13 (𝑦 = 𝑥𝑤 𝐵 → ((𝜑𝑦𝐷𝑧𝐷) ↔ (𝜑 𝑥𝑤 𝐵𝐷𝑧𝐷)))
78 uneq1 3722 . . . . . . . . . . . . . 14 (𝑦 = 𝑥𝑤 𝐵 → (𝑦𝑧) = ( 𝑥𝑤 𝐵𝑧))
7978eleq1d 2672 . . . . . . . . . . . . 13 (𝑦 = 𝑥𝑤 𝐵 → ((𝑦𝑧) ∈ 𝐷 ↔ ( 𝑥𝑤 𝐵𝑧) ∈ 𝐷))
8077, 79imbi12d 333 . . . . . . . . . . . 12 (𝑦 = 𝑥𝑤 𝐵 → (((𝜑𝑦𝐷𝑧𝐷) → (𝑦𝑧) ∈ 𝐷) ↔ ((𝜑 𝑥𝑤 𝐵𝐷𝑧𝐷) → ( 𝑥𝑤 𝐵𝑧) ∈ 𝐷)))
81 fiiuncl.un . . . . . . . . . . . 12 ((𝜑𝑦𝐷𝑧𝐷) → (𝑦𝑧) ∈ 𝐷)
8280, 81vtoclg 3239 . . . . . . . . . . 11 ( 𝑥𝑤 𝐵𝐷 → ((𝜑 𝑥𝑤 𝐵𝐷𝑧𝐷) → ( 𝑥𝑤 𝐵𝑧) ∈ 𝐷))
8375, 82vtoclg 3239 . . . . . . . . . 10 (𝑢 / 𝑥𝐵𝐷 → ( 𝑥𝑤 𝐵𝐷 → ((𝜑 𝑥𝑤 𝐵𝐷𝑢 / 𝑥𝐵𝐷) → ( 𝑥𝑤 𝐵𝑢 / 𝑥𝐵) ∈ 𝐷)))
8466, 67, 69, 83syl3c 64 . . . . . . . . 9 ((𝜑𝑢𝐴 𝑥𝑤 𝐵𝐷) → ( 𝑥𝑤 𝐵𝑢 / 𝑥𝐵) ∈ 𝐷)
8559, 60, 65, 84syl3anc 1318 . . . . . . . 8 ((((𝜑𝑢 ∈ (𝐴𝑤)) ∧ (𝑤 ≠ ∅ → 𝑥𝑤 𝐵𝐷)) ∧ ¬ 𝑤 = ∅) → ( 𝑥𝑤 𝐵𝑢 / 𝑥𝐵) ∈ 𝐷)
8658, 85pm2.61dan 828 . . . . . . 7 (((𝜑𝑢 ∈ (𝐴𝑤)) ∧ (𝑤 ≠ ∅ → 𝑥𝑤 𝐵𝐷)) → ( 𝑥𝑤 𝐵𝑢 / 𝑥𝐵) ∈ 𝐷)
8727, 86syl5eqel 2692 . . . . . 6 (((𝜑𝑢 ∈ (𝐴𝑤)) ∧ (𝑤 ≠ ∅ → 𝑥𝑤 𝐵𝐷)) → 𝑥 ∈ (𝑤 ∪ {𝑢})𝐵𝐷)
8887a1d 25 . . . . 5 (((𝜑𝑢 ∈ (𝐴𝑤)) ∧ (𝑤 ≠ ∅ → 𝑥𝑤 𝐵𝐷)) → ((𝑤 ∪ {𝑢}) ≠ ∅ → 𝑥 ∈ (𝑤 ∪ {𝑢})𝐵𝐷))
8988ex 449 . . . 4 ((𝜑𝑢 ∈ (𝐴𝑤)) → ((𝑤 ≠ ∅ → 𝑥𝑤 𝐵𝐷) → ((𝑤 ∪ {𝑢}) ≠ ∅ → 𝑥 ∈ (𝑤 ∪ {𝑢})𝐵𝐷)))
9089adantrl 748 . . 3 ((𝜑 ∧ (𝑤𝐴𝑢 ∈ (𝐴𝑤))) → ((𝑤 ≠ ∅ → 𝑥𝑤 𝐵𝐷) → ((𝑤 ∪ {𝑢}) ≠ ∅ → 𝑥 ∈ (𝑤 ∪ {𝑢})𝐵𝐷)))
91 fiiuncl.a . . 3 (𝜑𝐴 ∈ Fin)
925, 9, 13, 17, 20, 90, 91findcard2d 8087 . 2 (𝜑 → (𝐴 ≠ ∅ → 𝑥𝐴 𝐵𝐷))
931, 92mpd 15 1 (𝜑 𝑥𝐴 𝐵𝐷)
 Colors of variables: wff setvar class Syntax hints:  ¬ wn 3   → wi 4   ∧ wa 383   ∧ w3a 1031   = wceq 1475  Ⅎwnf 1699   ∈ wcel 1977   ≠ wne 2780  ⦋csb 3499   ∖ cdif 3537   ∪ cun 3538   ⊆ wss 3540  ∅c0 3874  {csn 4125  ∪ ciun 4455  Fincfn 7841 This theorem was proved from axioms:  ax-mp 5  ax-1 6  ax-2 7  ax-3 8  ax-gen 1713  ax-4 1728  ax-5 1827  ax-6 1875  ax-7 1922  ax-8 1979  ax-9 1986  ax-10 2006  ax-11 2021  ax-12 2034  ax-13 2234  ax-ext 2590  ax-sep 4709  ax-nul 4717  ax-pow 4769  ax-pr 4833  ax-un 6847 This theorem depends on definitions:  df-bi 196  df-or 384  df-an 385  df-3or 1032  df-3an 1033  df-tru 1478  df-ex 1696  df-nf 1701  df-sb 1868  df-eu 2462  df-mo 2463  df-clab 2597  df-cleq 2603  df-clel 2606  df-nfc 2740  df-ne 2782  df-ral 2901  df-rex 2902  df-rab 2905  df-v 3175  df-sbc 3403  df-csb 3500  df-dif 3543  df-un 3545  df-in 3547  df-ss 3554  df-pss 3556  df-nul 3875  df-if 4037  df-pw 4110  df-sn 4126  df-pr 4128  df-tp 4130  df-op 4132  df-uni 4373  df-iun 4457  df-br 4584  df-opab 4644  df-tr 4681  df-eprel 4949  df-id 4953  df-po 4959  df-so 4960  df-fr 4997  df-we 4999  df-xp 5044  df-rel 5045  df-cnv 5046  df-co 5047  df-dm 5048  df-rn 5049  df-res 5050  df-ima 5051  df-ord 5643  df-on 5644  df-lim 5645  df-suc 5646  df-iota 5768  df-fun 5806  df-fn 5807  df-f 5808  df-f1 5809  df-fo 5810  df-f1o 5811  df-fv 5812  df-om 6958  df-1o 7447  df-er 7629  df-en 7842  df-fin 7845 This theorem is referenced by:  fiunicl  38261  caragenfiiuncl  39405
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